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TypeScript Language Features: <code>Analyzing '...' and its dependencies</code> takes crazy long time!

Domain: PerformanceReports of unusually slow behaviorReports of unusually slow behavior

Help WantedYou can do thisYou can do this

Possible ImprovementThe current behavior isn't wrong, but it's possible to see that it might be better in some casesThe current behavior isn't wrong, but it's possible to see that it might be better in some cases

Status: Open.

#62230 In microsoft/TypeScript;

· babakfp opened on Aug 7, 2025

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Backlog

Form controller bricks intellsense for rest of session

Domain: PerformanceReports of unusually slow behaviorReports of unusually slow behavior

Needs More InfoThe issue still hasn't been fully clarifiedThe issue still hasn't been fully clarified

Status: Open.

#62192 In microsoft/TypeScript;

· ProgramPhantom opened on Aug 3, 2025

Control Flow Analysis Performance Regression

Domain: PerformanceReports of unusually slow behaviorReports of unusually slow behavior

Help WantedYou can do thisYou can do this

Possible ImprovementThe current behavior isn't wrong, but it's possible to see that it might be better in some casesThe current behavior isn't wrong, but it's possible to see that it might be better in some cases

Status: Open.

#62050 In microsoft/TypeScript;

· xpy5910 opened on Jul 12, 2025

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Backlog

Performance degrades the more wildcards that are contained in TSConfig include or exclude patterns

Domain: PerformanceReports of unusually slow behaviorReports of unusually slow behavior

Experimentation NeededSomeone needs to try this out to see what happensSomeone needs to try this out to see what happens

Possible ImprovementThe current behavior isn't wrong, but it's possible to see that it might be better in some casesThe current behavior isn't wrong, but it's possible to see that it might be better in some cases

Status: Open.

#61103 In microsoft/TypeScript;

· MichaelMitchell-at opened on Feb 3, 2025

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Backlog

Long running encodedSemanticClassifications-full request

BugA bug in TypeScriptA bug in TypeScript

Domain: PerformanceReports of unusually slow behaviorReports of unusually slow behavior

Status: Open.

#59655 In microsoft/TypeScript;

· roryscot opened on Aug 16, 2024

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TypeScript 5.7.0

Performance: Monomorphic AST Nodes

Domain: PerformanceReports of unusually slow behaviorReports of unusually slow behavior

In DiscussionNot yet reached consensusNot yet reached consensus

SuggestionAn idea for TypeScriptAn idea for TypeScript

Status: Open.

#59198 In microsoft/TypeScript;

· dragomirtitian opened on Jul 9, 2024

Investigate Wildcard Matching Performance

Domain: PerformanceReports of unusually slow behaviorReports of unusually slow behavior

SuggestionAn idea for TypeScriptAn idea for TypeScript

Status: Open.

#59058 In microsoft/TypeScript;

· DanielRosenwasser opened on Jun 27, 2024

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TypeScript 5.6.0

Typescript 5.5 performance regression on arktype

BugA bug in TypeScriptA bug in TypeScript

Domain: PerformanceReports of unusually slow behaviorReports of unusually slow behavior

Status: Open.

#58805 In microsoft/TypeScript;

· DanielRosenwasser opened on Jun 7, 2024

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TypeScript 5.6.0

Defer TransformFlags Calculation

Domain: PerformanceReports of unusually slow behaviorReports of unusually slow behavior

Experimentation NeededSomeone needs to try this out to see what happensSomeone needs to try this out to see what happens

SuggestionAn idea for TypeScriptAn idea for TypeScript

Status: Open.

#58395 In microsoft/TypeScript;

· DanielRosenwasser opened on May 1, 2024

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TypeScript 5.6.0

TS hangs up entire computer, type of variables stuck at "Loading..."

BugA bug in TypeScriptA bug in TypeScript

Domain: PerformanceReports of unusually slow behaviorReports of unusually slow behavior

Status: Open.

#58373 In microsoft/TypeScript;

· slyofzero opened on Apr 30, 2024

TypeScript should have optimized this conditional check

Domain: PerformanceReports of unusually slow behaviorReports of unusually slow behavior

Help WantedYou can do thisYou can do this

Possible ImprovementThe current behavior isn't wrong, but it's possible to see that it might be better in some casesThe current behavior isn't wrong, but it's possible to see that it might be better in some cases

Status: Open.

#56172 In microsoft/TypeScript;

· steveluscher opened on Oct 22, 2023

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Backlog

Performance regression from #49625 and #52984

BugA bug in TypeScriptA bug in TypeScript

Domain: PerformanceReports of unusually slow behaviorReports of unusually slow behavior

RescheduledThis issue was previously scheduled to an earlier milestoneThis issue was previously scheduled to an earlier milestone

Status: Open.

#55948 In microsoft/TypeScript;

· epmatsw opened on Oct 2, 2023

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TypeScript 5.7.0